iPhone 4 iOs 6.1 Signal issues

I've had my iPhone 4 for a while and never had a problem, however, when I updated to 6.1 I have signal issues. I am on o2, I have normally 3-5 all the time 3G signal. When I updated to 6.1 I now have no service at least 30% of the time or my signal goes from full signal to 1 bar to no service to full signal within seconds of each other. It makes no difference if I am connected to wifi or not and does it in different locations. Its not my sim because I've used to sim in a different phone so its nothing to do with o2-uk. I've turned my 3G off to see if that makes a difference it doesn't. I'm out of warranty now and when I rang apple support they wanted to charge me to discuss it! Not impressed! Any advice or fixes?

I'm still waiting they have done something for the iPhone 4S but nothing for the 4. Apparently they are not doing anything for the iPhone 4 because the majority of people don't have it and its getting phased out kind of like the old iPhone 3's

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